Spring项目基本搭建

1. 导包

• 核心包

  • beans
  • context
  • core
  • expression

• 日志包

  • com.springsource.org.apache.commons.logging
  • com.springsource.org.apache.log4j（老版本需要，新版本不需要）

---

2. 创建一个对象

User.java

package cn.jjs.bean;

public class User {
    private String name;
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

---

3.导入约束

要求

Spring的配置文件，命名任意，位置任意。但是，一般命名为applicationContext.xml并放置在src下。

导入约束

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

beans> 

将User对象交给Spring容器管理

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    
    <bean name="user" class="cn.jjs.bean.User">

    bean>
beans>

---

4.测试类

package cn.jjs.helloSpring;

import cn.jjs.bean.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Demo {
    @Test
    public void Test() {
        //1. 创建容器对象
        ApplicationContext ac = new ClassPathXmlApplicationContext("cn/jjs/bean/applicationContext.xml");
        //2. 向容器"要"user对象
        User u = (User) ac.getBean("user");
        //3. 打印对象
        System.out.println(u);

    }
}